A year after Loki's devastating alien attack on New York, the Mighty Thor along with his friends Lady Sif and the Warriors Three fight to save the Nine Realms from deadly threats. When Thor's girlfriend Jane Foster discovers a fluid like weapon called the Aether, she unknowingly awakens the evil Malekith and his Dark Elf army. With this, Asgard may be facing it's darkest hour. Thor forms an uneasy alliance with his nemesis Loki to save Jane, stop Malekith and save the Nine Realms from total chaos and darkness.

The warrior Thor (Hemsworth) is cast out of the fantastic realm of Asgard by his father Odin (Hopkins) for his arrogance and sent to Earth to live among humans. Falling in love with scientist Jane Foster (Portman) teaches Thor much-needed lessons, and his new-found strength comes into play as a villain from his homeland sends dark forces toward Earth.